Syringe



June 29, 1943. A. E. SMITH.

SYRINGE Original Fil ed May-5, 1959 INVENTOR.

ARTHUR E. 51mm ATTO EY.

lulu! 5 l \ll u. Zi kiiiiilh Patented June 29, 1943 SYRINGE Arthur E. Smith, hos Angeles, Calif.

Original application May 5, 1939, Serial No.

271,886. Divided and this application January 15, 1940, Serial No. 313,906

2 Claims.

This invention relates to hypodermic syringes.

The general object of the invention is to provide an improved ampule type hypodermic syringe which is adapted for producing local anaesthesia.

Another object of the invention is to provide an improved ampule for use in preparing fresh solutions for injection.

A further object of the invention is to provide a novel cork construction for use in a hypodermic ampule.

Other objects and the advantages of my invention will be apparent from the following description taken in connection with the accompanying drawing, wherein:

Fig. l is a central sectional view showing my invention;

Fig. 2 is a fragmentary central sectional view through an ampule embodying the features of my invention;

Fig. 3 is a section taken on line 3--3, Fig. 2; and

Fig. 4 is a fragmentary sectional view showing the tablet being discharged.

This application is a division of my copending application Serial No. 271,886 filed May 5, 1939,.

now Patent No. 2,271,720 patented Feb. 3, 1942.

Referring to the drawing by reference characters I have shown my invention as embodied in a syringe which is indicated at H]. As shown the syringe includes a barrel H having a one piece front member l2 and a rear member 13. The front member includes a needle receiving portion 14 and has a needle l5 mounted therein the pointed inner end N5 of which extends into the barrel.

The cap I3 is threaded to the barrel as at I! and includes a telescoping portion l8 which has a flanged head I9 thereon. A spring 29 engages the head and the inner portion of the cap thus tending to separate the head from the cap. A plunger rod 2| is slidable through the cap and is provided at its lower end with a flange 22.

An ampulse embodying the features of my invention is indicated generally at 24 and as shown comprises a cylindrical glass tube which at its rear end is provided with a piston cork 25 which has an end 21 engaging the flange 22 and an internal enlarged recess 28 opening into the ampule.

At the front end the ampule is provided with a cork indicated generally at 29 which includes an outer resilient element 39 having an outer flange 39' and having an end wall 39" and having a recess 3| therein which opens inwardly and a sec- 0nd element 32 having an inner wall 33 forming a recess 34. The corks 25, 30 and 32 may be made of rubber or other suitable resilient material.

The recess 34 provides a chamber for a medicinal tablet 35 which when in place in the chamber is hermetically sealed from the fluid and vehicular contents 36 of the ampule. The inner wall 33 is severed on a line 31 (see Fig. 3) to provide a trap door 38 the periphery of which is held normally in fluid tight position by the resiliency of the material of the cork, but which can be displaced as will be later described.

The front member I 2 includes a tube or piercing needle 39 which extends inwardly and which receives the inner end I6 of the needle I5. The tube 39 i provided with an opening or openings 39 through which the fluid 36 may pass to the needle l5.

In use the ampule is placed in the barrel after which the end member I3 is secured in place with the head l9 engaging the end of the ampule and with the flange 22 seated upon the cork 25 which serves as a piston and is adapted to be moved by the flange 22 when the plunger is pressed as will be readily understood.

As the rear member I3 is moved to position, the member 39 pierces the lower wall 39 of the cork 30 then passes through, or pushes to one side, the tablet 35 and then impinges upon and opens the trap door 38 allowing the tablet material to pass into the liquid contents of the ampule. As the plunger is moved inwardly, the cork 25 moves inwardly thus forcing the contents of the ampule through the needle l5.

With the construction including the trap door a hermetic seal is provided with the rubber of the trap door member having a cushioning ealing engagement with the adjacent portion of the cork so that a tight seal is maintained but which is readily broken when the syringe is operated.

Having thus described my invention, I claim:

1. In a syringe, a barrel having a front member thereon, a needle on the front member and extending into the barrel, a tube on the front member and surrounding the needle and projecting beyond the needle into the barrel, said tube having a lateral opening therein disposed within the barrel, an ampule in the barrel, said ampule having a resilient cork therein, said cork having a diaphragm at the outer end thereof and adapted to be punctured by the tube, said cork having a recess and a trap door closure for the recess and adapted to be displaced by said tube, said trap door being integral with the element having a recess with a thin imperforate" Wall forming a closure for the recess, said thin imperforate wall being adapted to be pierced by said hollow member, the inner cork element being disposed adjacent to the outer cork element and forming a chamber in conjunction with the outer cork element, said inner cork element having a closure for the chamber, said closure being partially severed from the inner element by a curved line of severance which is spaced from the outer periphery of theinner cork element to provide a trap door, the periphery of the trap door being normally held in fluid tight engagement against the inner periphery of the inner cork element wall by the resiliency of the material of the trap door and by the resiliency of theinner cork element and being adapted to be displaced, a medicinal preparation between said inner and outer elements, a member closing the other end of the ampule, and a vehicle for the drug between the other end closure and the inner cork element.

ARTHUR E. SMITH. 

